Am 3. September 2018 16:48:23 schrieb Gerrit Heitsch <gerrit@laosinh.s.bawue.de>: > On 09/03/2018 10:14 AM, André Fachat wrote: >> Hi Bo, >> >> Am 3. September 2018 09:52:20 schrieb Bo Zimmerman <bo@zimmers.net>: >> >>> Hello all, >>> >>> After check both(!) books on Plus/4 programming, and the 6551 schematic, >>> and doing experimenting... I have a question. Does anyone know the >>> kosher way to change the user port RTS signal so that the modem knows to >>> stop transmitting data while a program catches up? I'm initializing the >>> Command Register to 5 (RTS low/enabled, DTR enabled, IRQ, no party, no >>> echo). But bad things seem to happen when I attempt to touch it again >>> to change RTS to high/disabled. Does anyone have any knowledge or >>> experience with this? >> >> In my experience the rts/cts/dtr lines are completely broken in the ACIA. >> >> They switch off rx and/or tx at inconvenient times and in the middle of >> transactions. >> >> So no, I don't know a good wayof using them, sorry > > I only know about CTS being broken, it will turn off the transmitter in > the middle of a byte and that's why the CTS line of the 6551 in the > Plus/4 is connected to GND. > > RTS is an output and tells the other side that you are ready to receive > data. According to my Rockwell data handbook, if you set RTS inactive via the command register, it disables the Transmitter. Bummer. André > > Gerrit > >Received on 2018-09-03 18:00:04
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